Alls it does is tells the computer the intake air is cooler than it is. Therefore the computer advances the timing(or retards don't remember) and it dumps more fuel to compensate for the cooler air. Alls this will do is make the car run rich and you could foul a plug. These things are pieces of **** you can buy at radio shack for 15 cents. Don't waste your money.
Thanks for the replies...I thought it was too easy to be true. I had not noticed these when I was upgrading my old Fox body. I'll stick with the basics, change the gears to 3.73, pulley's, and maybe look at the predator chip....nothing too fancy.